The `req` object returned from `initReq` does not include the `user`
property, and instead returned `user` and `i18n` _alongside_ the req
(and in the case of `i18n`, duplicately, as it was _also_ on the req).
Now, these properties exist directly on the req itself as expected. The
`initPage` function was also unnecessary instantiating a new local req
object just to override the `headers`, `url`, and `query` properties.
Instead of doing this, we now support overriding properties upon
instantiating a new req, bypassing the need to create an entirely new
object.
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